the leakage around the cabin boards is typical. I solved mine by putting thin rubber weather stripping (Ace Hardware) on the bottom of each board (especially the bottom one). I also put the rubber weather stripping inside the metal channels on the sides of entrance the boards fit into. You might hav...

If you sail regularly/often that will help keep down growth. When it sits for a couple weeks growth goes crazy. And yes, power wash ASAP when you pull it out. I've also seen people use a long handled brush to clean the waterline regularly which is where growth happens 1st.

I'd think you'll need bottom paint or the crud will get pretty heavy. Mine is slipped 24/7 in Green Bay for 4-5 months. It has bottom paint but still get some heavy growth in spots I can't get bottom pain on.

by battery in my C22 is inside the boat as close as possible to bottom center. Since it's heavy IMO it should be as close to center of centerline and as low as possible to help make the center of gravity as low and near middle as possible. Not sure why it can't be in the cabin if it's in a battery b...

My C22 had seepage onto the sole floor when I got it. Finally traced it to a crack in the fuel locker (aft middle) due to they'd put a heavy battery in there. I believe the battery bouncing when trailering cracked the floor of that compartment near the seam with the stern. I moved the battery into t...

my concern would be those cracks/seams where water is coming in. I'd assume you get air temps often that are below freezing even though the lake isn't freezing over. Moisture in those leaking cracks/seams is going to freeze and expand, making the problem worse. Moisture is also probably getting in t...

IMO not sure I'd replace the foam. If it's a sealed compartment that should be sufficient as a "safety measure". Closed cell foam will be very expensive and open cell will just become water logged again.

not at all an expert on the C22 keel, but there are more forces while under sail than just "supporting" the weight of the keel. Guess I'm overcautious, but in my experience of doing 30 years of hardware design I'd think the entire hull including the trunk act as a single "monohull" structure. There ...

I think failure on the water could mean the heavy swing keel rips the bottom out of the boat and everything sinks very fast. I'd suspect you'll be removing the swing keel and rebuilding the trunk, or scrapping the boat (sorry). Please error on the side of caution/safety.